Update:

>> how long do you think it will be before we can get specifications on
>> the P5 that are as good as those you referenced on the SB810/850?

> Somewhen in the course of this year, I guess.

It's 2011 still, and the QorIQ P5 product brief is publicly available:

http://www.freescale.com/files/32bit/doc/prod_brief/P5020PB.pdf

Also, there's a narrated P5 overview on Youtube:

http://www.youtube.com/watch?v=jkmmcqIpTwM